The Farman H.F.20 had proved to be fragile and underpowered, so the Farman H.F.27 increased engine power, wingspan, and replaced the boom structure with all-metal fittings. Aviation Militaire declined to buy any, but fifty were built in Russia, the RFC equipped two squadrons, thirty-four were used by the RNAS. They had a long lifetime, a testament to their improved durability, and Zeppelin LZ-38 was destroyed in its shed by RNAS HF.27s. Greece purchased four for use in the Aegean. 
|First flight||Feb 1915 |
|Primary users|| Russia|
|Number built||RNAS: 80; Russia 50 |
|Developed from||Farman H.F.20|
|Wingspan||16.2 m (53 ft) |
|Engine||140hp Gnome rotary or|
|Armament||front flexible MG|
250 kg (560 lb) of bombs
|Max Speed||147 km/h (91 mph)[note 1]|
|Climb||2,000 m (6,560 ft) in 12:00-14:00|
3,000 m (10,000 ft) in 25:00
4,000 m (13,100 ft) in 30:00[note 2]
|Ceiling||4,800 m (15,700 ft)|
|Range||520 km (320 mi)[note 3]|
|Endurance||2:40  [note 4]|
For more information, see Wikipedia:Farman HF.20.
- Davilla, p.215.
- Lamberton, p.84.
- Lamberton, p.218-220.
- Davilla, p.217.
- Durkota, p.357.
- Durkota, p.350.
- Dr. James J. Davilla and Arthur M. Soltan. French Aircraft of the First World War. Flying Machines Press, 1997. ISBN 0-9637110-4-0.
- Alan Durkota, Thomas Darcey, and Victor Kulikov. The Imperial Russian Air Service. Flying Machines Press, 1995. ISBN 0-9637110-2-4
- W.M. Lamberton and E.F. Cheesman, Reconnaissance & Bomber Aircraft of the 1914-1918 War. Great Britain: Harleyford Publications Ltd., 1962.